Die press



F. CATES.

DIE PRESS. APPL'lcAnoN m50 APR. 2. |921.

Patented May 9,1922.

Ultimi@ STTE saveur ors COMPANY, OF CINCINNATI,

OHO, A CORPORATON OF OHIO.

DIE PRESS.

Application med April 27,

T 0 all whom t may concern:

Be it known that FREDERICK CoA'rEs, a citizen of the United States,residing at Cincinnati, in the county of Hamilton and State of Ohio, hasinvented certain new and useful improvements in Die Presses, of whichthe following is a specification.

This invention relates to the manufacture of paper containers of thetype known as paper'cans.

More especially the invention relates to a die press for the manufactureof' ends or closures for paper cans. V

One important object of the inventionv is to improve and simplify thegeneral construction of devices of this character.

second important object of the `invention is to provide an improved formof die press especially7 adapted for operating upon paper in a plasticstate. f

A third important object of the invention is to provide an improved formof die press having' special arrangements for stripping the formed canend from the dies automatically so that no injury is done to thematerial. y

A fourth important object of the invention is to provide an improvedform of die press wherein the material may be formed while plastic anddried out in the press. Y

A fifth important object of the invention is to provide an improved formof die press for this purpose which is peculiarly adapted to be used inconnection with automatic or semi-automatic end forming' machinery.

VVi'th the above and other objects in view, the invention consists ingeneral of certain novel details of construction and combina-v tions ofparts hereinafter fully described, illust-rated in the accompanyingdrawings, land specilically claimed.

ln the accompanying drawings, like characters of reference indicate likeparts in the several views, and

Figure 1 is a vertical median section through a die press constructed inaccordance with 'his invention, the several parts being' shown instripped position.

Figure 2 is a section similar to Figure 1 but showing' only the lowerpart of that figure and with the severalparts in pressing` position.

ln the embodiment of the invention as herein illustrated there isprovided a standv,ard v10 and projecting from this standardSpecification of Letters Patent. Patgntd Rigby 9, 1922,

1921. Serial No. 464,836.

is an arm 11 carrying the lower or female die. This 'die consists of asubstantially circular body portion 12 having a recess 13 in its upperbase corresponding in size with the inside of the can or container thetop for which is to be pressed by this machine. Extending through thebottom of the die 12 is a stemt or plunger 14 which carries on its upperend a stripper plate 15 of substantially the same diameter as the recess13. Normally holding this stripper plate in elevated position is a coilspring 16. A nut 17 on the lower end of the stem 14 prevents thestripper Aplate from rising out of the recess 13. Surrounding the recess13 an annular channel 18 which is formed concentric with said recess.

Extending out from the prop or support 10 above the bracket 11 is asecond bracket 19 which carries on its outer end a sleeve 2O forming aguide sleeve. vSlidable within the sleeve 2O is a die support 21 in theform of a hollow cylinder and carrying at its lower end'an annular die22 cooperating with the annular recess 18 as will be herelnafterdescribed. `Within the die support 21 is a. plunger 23 which is ofsomewhat greater length than the die support and has a reduced lower`end 24 whereon is mounted a male die 25 cooperating with the recess 13.1While the annular recess 18 is concentric to the recess 13 there isleft a considerable space between said annular recess and the recess 13.In like manner space is left between the male dies 22 and 25 and withinthis space is a floating stripper ring` 26 having an internal flange 27normally resting on a peripheral 'Harige surface 23 formed on a male die25. 1n one side of the guide' sleeve 2O is a vertical slot 29 and in thedie support 21 is a similar slot 30. Screwed to the plunger 23 andprojectingi through the slot 3() into the slot 29 is a pin 31. 1t willthus be seen that this pin in its action within the slot 29 will limitthe movement of the plunger 23 vertically. it the same time this pinwill also limit the movement of the die support 21 both with referenceto the hollow sleeve 2O and to the plunger 23. Secured to a pin 32projectingl from the side of the sleeve 20 is a coil tension spring 33which has its lower end secured to a pin 34C projecting from the die 22.The action of the spring 33 l is to lnormally hold the die support 21raised and, as a consequence of the co-action ot the stop pin 3l andslot 30, this spring willalso hold the plungei` 23 and its die 25raised.

Extending downward 'from the sleeve 2U is a series or pins 35 which areso positioned as to pass through openings 36 in the die 22 and engagethe upper surface of the ring 26 when the latter is raised. These pinsthus substitute limit stops for the ring 26 and through the co-actionoit this ring and the die 25 also aid in limiting the upward movement ofthe die 25.

Above the dies is arranged a. pair 01 levers 37 and 38 pivotallyconnected to thesupport l0. (lne of' these levers is arranged to engagethe top ot the plunger 23, a. projection 39 being provided on the leverfor that purpose. The other lever 37 has a projection 40 which isarranged to engage,when the lever is depressed, a flange il formed onthe top of the die support 21.

0n the die l2 are arranged positioning pins l2 and beneath said die is aheater ring 43 in the form of an ordinary gas ring so that the die l2 isat all times kept hot.

For the purpose of illustrating the action of the devicea can end or top'l has been shown in position in the die. j

ln the operation of the device the parts start in the positionkshown inFigure l. l/Vhen the parts are in this position the operator takes adisk of the material from which the can top is to be made and places thesame, while still-in its plastic state, on the female die against thepositioning pins 42. The lever 38 is then depressed and this forces theplunger 23 downward. The die 25 enters the recess 13 and bends thecentral portion of the disk downward to form a. bumped center for theclosure. At the same time the pin 3l causes the die support 2l with itsdie 22 to move downward but it is to be noted that in the position ofFigure l the die 22 is raised above the die 25. Consequently7 in thisstage of the operation the peripheral portion orn the disk T is notacted upon. After the die 25 has reached the lowerinost position thelever 3T is then depressed. lThis causes downward movement of the diesupport 2l with its annular die 22. Consequently7 the peripheral portionoit the disk 'i is bent downward as clearly shown in the figures, therib between the vrecess 1S and recess i3 forming a channel around thecenter of the disk. The parts will then be in the positioii shown in l11igure The operator then releases the lever and the spring 29 draws thedies 25 and 22 upward. in the tirst part oi? the operation the stripperplate l5 forces the 'formed disk, which has been held in the dies untilthe heat from the burner i3 has dried it suiiiciently to attain theform, out oi the recess 13. At this time the top T will be engaged onthe die 25. As further upward movement takes place the ring stripper 26engages the pins 35 and is held against upward movement while at thesame time the die 25 continues to move upwardly. This forces the formedtop od of the die 25. it is then removed by the operator and a freshdisk put in position.

There has thus been provided a simple and eiiicient device of the kinddescribed and for the purpose specified. f

lt is obvious that minor changes may be made in the form andconstruction of the invention without departing from the materialprinciples thereof. it is not therefore desired t0 confine the inventionto the exact form therein shown and described, but it is wished 'toinclude all such as properly come within the scope claimed.

Having thus described the invention, what is claimed as new, is

l. ln a device of the kind described, a hollow die support havinglongitudinal slot in one side, a die carrying plunger slidable in saidsupport and having a pin projecting into said slot, dies on the supportand plunger, yieldable means normally holding the support and plungerout of operation with the pin in the lower end of the slot, means toengage the plunger and move the same against the action of the yieldablemeans whereby said pin will cause similar movement of the hollow diesupport, and means to engage said. support to continue movement thereofafter the plunger ceases to move.

2. ln a device of the kind described, a hollow die support havinglongitudinal slot in one side, a die carrying plunger slidable in saidsupport and having a pin projecting into said slot, dies on the supportand plunger, yieldable means normally holding the support and plungerout of operation with the pin in the lower end of the slot, means toengage the plunger and move the same against the action of the yieldablemeans whereby said pin will cause similar movement of theI hollow diesupport, means 'to engage said support to continue movement thereoila'lfter the plunger ceases 'to move, a clamp and stripper ring mountedbetween the dies, and movable with respect to said dies in a directionlongitudinally of the support and plunger, and means to limit movementof said clamp ring.

3. ln a die press for forming tops for paper containers, a guide sleeve,a die sup1 porting sleeve slidable therein and having a. slot extendinglongitudinally of one side, a plunger slidable within the last sleeveand carrying a pin projecting' into the slot, an annular die carried bythe second sleeve, a male die carried by the plunger and having itsperiphery in spaced relation to the inside or the annular die, a clampand stripper ring arranged in the space between said dies and clamp andstripper ring, and limit pins having a flange engaging the male die tofixed to the first sleeve and projecting limit downward movement of thering, a through the annular die to engage the ring. l0 female die havinga central recess for the In testimony whereof I aiiX my signasecond dieand an annular channel for the ture.

first mentioned die, the wall between said recess and channel beingopposed to the FREDERICK COATES.

